/*
 * #%L
 * Bio-Formats Plugins for ImageJ: a collection of ImageJ plugins including the
 * Bio-Formats Importer, Bio-Formats Exporter, Bio-Formats Macro Extensions,
 * Data Browser and Stack Slicer.
 * %%
 * Copyright (C) 2006 - 2015 Open Microscopy Environment:
 *   - Board of Regents of the University of Wisconsin-Madison
 *   - Glencoe Software, Inc.
 *   - University of Dundee
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 2 of the 
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public 
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-2.0.html>.
 * #L%
 */

/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package loci.plugins.config;

import java.awt.Component;
import java.awt.Container;

import javax.swing.Spring;
import javax.swing.SpringLayout;

/**
 * A 1.4 file that provides utility methods for
 * creating form- or grid-style layouts with SpringLayout.
 * These utilities are used by several programs, such as
 * SpringBox and SpringCompactGrid.
 */
public class SpringUtilities {

  /**
   * A debugging utility that prints to stdout the component's
   * minimum, preferred, and maximum sizes.
   */
  public static void printSizes(Component c) {
    System.out.println("minimumSize = " + c.getMinimumSize());
    System.out.println("preferredSize = " + c.getPreferredSize());
    System.out.println("maximumSize = " + c.getMaximumSize());
  }

  /**
   * Aligns the first <code>rows</code> * <code>cols</code>
   * components of <code>parent</code> in
   * a grid. Each component is as big as the maximum
   * preferred width and height of the components.
   * The parent is made just big enough to fit them all.
   *
   * @param rows number of rows
   * @param cols number of columns
   * @param initialX x location to start the grid at
   * @param initialY y location to start the grid at
   * @param xPad x padding between cells
   * @param yPad y padding between cells
   */
  public static void makeGrid(Container parent,
    int rows, int cols, int initialX, int initialY, int xPad, int yPad)
  {
    SpringLayout layout;
    try {
      layout = (SpringLayout) parent.getLayout();
    }
    catch (ClassCastException exc) {
      System.err.println(
        "The first argument to makeGrid must use SpringLayout.");
      return;
    }

    Spring xPadSpring = Spring.constant(xPad);
    Spring yPadSpring = Spring.constant(yPad);
    Spring initialXSpring = Spring.constant(initialX);
    Spring initialYSpring = Spring.constant(initialY);
    int max = rows * cols;

    //Calculate Springs that are the max of the width/height so that all
    //cells have the same size.
    Spring maxWidthSpring =
      layout.getConstraints(parent.getComponent(0)).getWidth();
    Spring maxHeightSpring =
      layout.getConstraints(parent.getComponent(0)).getWidth();
    for (int i = 1; i < max; i++) {
      SpringLayout.Constraints cons =
        layout.getConstraints(parent.getComponent(i));

      maxWidthSpring = Spring.max(maxWidthSpring, cons.getWidth());
      maxHeightSpring = Spring.max(maxHeightSpring, cons.getHeight());
    }

    //Apply the new width/height Spring. This forces all the
    //components to have the same size.
    for (int i = 0; i < max; i++) {
      SpringLayout.Constraints cons =
        layout.getConstraints(parent.getComponent(i));

      cons.setWidth(maxWidthSpring);
      cons.setHeight(maxHeightSpring);
    }

    //Then adjust the x/y constraints of all the cells so that they
    //are aligned in a grid.
    SpringLayout.Constraints lastCons = null;
    SpringLayout.Constraints lastRowCons = null;
    for (int i = 0; i < max; i++) {
      SpringLayout.Constraints cons =
        layout.getConstraints(parent.getComponent(i));
      if (i % cols == 0) { //start of new row
        lastRowCons = lastCons;
        cons.setX(initialXSpring);
      }
      else { //x position depends on previous component
        cons.setX(Spring.sum(lastCons.getConstraint(SpringLayout.EAST),
          xPadSpring));
      }

      if (i / cols == 0) { //first row
        cons.setY(initialYSpring);
      }
      else { //y position depends on previous row
        cons.setY(Spring.sum(lastRowCons.getConstraint(SpringLayout.SOUTH),
          yPadSpring));
      }
      lastCons = cons;
    }

    //Set the parent's size.
    SpringLayout.Constraints pCons = layout.getConstraints(parent);
    pCons.setConstraint(SpringLayout.SOUTH, Spring.sum(Spring.constant(yPad),
      lastCons.getConstraint(SpringLayout.SOUTH)));
    pCons.setConstraint(SpringLayout.EAST, Spring.sum(Spring.constant(xPad),
      lastCons.getConstraint(SpringLayout.EAST)));
  }

  /* Used by makeCompactGrid. */
  private static SpringLayout.Constraints getConstraintsForCell(
    int row, int col, Container parent, int cols)
  {
    SpringLayout layout = (SpringLayout) parent.getLayout();
    Component c = parent.getComponent(row * cols + col);
    return layout.getConstraints(c);
  }

  /**
   * Aligns the first <code>rows</code> * <code>cols</code>
   * components of <code>parent</code> in
   * a grid. Each component in a column is as wide as the maximum
   * preferred width of the components in that column;
   * height is similarly determined for each row.
   * The parent is made just big enough to fit them all.
   *
   * @param rows number of rows
   * @param cols number of columns
   * @param initialX x location to start the grid at
   * @param initialY y location to start the grid at
   * @param xPad x padding between cells
   * @param yPad y padding between cells
   */
  public static void makeCompactGrid(Container parent,
    int rows, int cols, int initialX, int initialY, int xPad, int yPad)
  {
    SpringLayout layout;
    try {
      layout = (SpringLayout)parent.getLayout();
    }
    catch (ClassCastException exc) {
      System.err.println(
        "The first argument to makeCompactGrid must use SpringLayout.");
      return;
    }

    //Align all cells in each column and make them the same width.
    Spring x = Spring.constant(initialX);
    for (int c = 0; c < cols; c++) {
      Spring width = Spring.constant(0);
      for (int r = 0; r < rows; r++) {
        width = Spring.max(width,
          getConstraintsForCell(r, c, parent, cols).getWidth());
      }
      for (int r = 0; r < rows; r++) {
        SpringLayout.Constraints constraints =
          getConstraintsForCell(r, c, parent, cols);
        constraints.setX(x);
        constraints.setWidth(width);
      }
      x = Spring.sum(x, Spring.sum(width, Spring.constant(xPad)));
    }

    //Align all cells in each row and make them the same height.
    Spring y = Spring.constant(initialY);
    for (int r = 0; r < rows; r++) {
      Spring height = Spring.constant(0);
      for (int c = 0; c < cols; c++) {
        height = Spring.max(height,
          getConstraintsForCell(r, c, parent, cols).getHeight());
      }
      for (int c = 0; c < cols; c++) {
        SpringLayout.Constraints constraints =
          getConstraintsForCell(r, c, parent, cols);
        constraints.setY(y);
        constraints.setHeight(height);
      }
      y = Spring.sum(y, Spring.sum(height, Spring.constant(yPad)));
    }

    //Set the parent's size.
    SpringLayout.Constraints pCons = layout.getConstraints(parent);
    pCons.setConstraint(SpringLayout.SOUTH, y);
    pCons.setConstraint(SpringLayout.EAST, x);
  }

}
